Call transmitter



8 Sheets-Sheet l l /NVENTOR By a. PAR/r//vsoN CALL TRANSMITTER F/s. /f-

n. r. n l E m m FIG; 6A

A TTORNEV March 4, 1947.

March 4, l D- B PARKINSON l CALL TRANSMITTER Filed July 50, 3.943l 8 Sheecs-Sheerl 2 /A/VE/v TOR D. B. PA RK/NSON A TTORNEV March 4 1947- A D. B. PARKlNsoN u v2,416,713 i CALL TRANSMITTER Filed July 3o, 1943 8 sheets-Sheet s A T TORNE' Y March 4, 1947. D. B. PARKINSON CALL TRANSMITTER s shee'tssneet. 4

f Filed July 3o, 1945 /Nll/E/VTOR BylDB. PARK/NSON ud-WacfM/( A TTORNf V .March 4, 1947 D. B. PARKINSON 2,416,713

' CALL TRANSMITTER Filed July so, 1945 s sheets-sheet `5 /NVE/v TOR D B. PA HKM/50N A TTORNEV MalCh 4, I .K BI pARKlNSQN '1 GALL TRANSMITTER Filed July 3o, 1943 a sheets-sheet e -lo-f I Y gyigc/Ml A T TORNE V March 4, D' B |5ARK|N1SON Y CALL TRANSMITTER,

Filed July 30, 1945 8 Sheets-Sheefl '7 legame n /N VEN TOR 0.8. PARK/NSON A T TOPNEV March 4, 1947. D' B PARKlNsON 2,416,713

' CALL TRANSMITTER Filed July 250,v 1945 8 Sheets-Sheet -8 /N VE N TOR 0.5. PARK/NSO/V A T TORNE V Patented Mar. 4, 1947 David B. Parkinson, Maplewood, N;4 ,I gssignorjt Bell Telephone Laboratories, Incorporated, New

York, N. Y., a corporation of NewYork 5" Application July 30, 1943', Skaainel96,747L

v14 claims. (chui- 380) VThis invention relates to telephone call transr'nitters of the type in which the successive operationj of numbered key members is effective to setcode members in position for controlling the operation of vibrative elements in a magnetic field for .transmitting signals corresponding to the' numbers of the operated keys'. 'The object of the linventitm is to improve the construction and operation of such call transmitters and to decrease the so-called dialing time inthetransmitting of telephone call designations. A fee` .t urej o f the invention isthe vprovision of a plurality offcodewheelsmounted for free .rotation on a cornmon shaft with'means for individually holding such wheels in normal non-operated' positionifollowing the Qtensioning of their respective actuating springs." `v Anotherv feature is the provision of 'a transfer mechanism for successively causing the operation ofthe code wheels under tension of their actuating springs according to the successive operation of .the keymembers;

Another feature is the provision of means carred by the code wheels engaging Vmeans actuated differentially bythe movement of the keysfor arrestingthe movement ofthe code Wheels to positions corresponding to the numbers of the keys [for setting a call, Withmeans positioned 'by the vsetting operationof the code wheels for indieating the number of the cal1. Another feature is .the provision of manually operable means for collectively returning the code Wheels to normal non-operated`position either following a code transmitting operation creancelling a Wrong call setting operation, the return movement of the Code wheels to normal retensioning their actuatingsprings. Y Another feature is the provision of a carriage, operable step by step, f or successively positioning feelermembers in registry relation ,Withthe code wheels, means being.l provided for automatically returning'. the carriage tenormal position at the corfnpletioniofv each vcall transmitting operation. y Another'ifeature is Vthe-1 y provision ofv a cam shaft actuatedb-y amotoyr, mechanism serving to move the -feeler members in coacting relation with the positioned code elementsin timed relation to the s tep-,bystenoperation of the carriage, the op- .t'onot that@ isb. t inaddition, Operating. plurality kofAriaans/"fr lioclsng'y and releasing the;.v`ibrative elements, Of the, generator vfdr transmitting. the. cali ,o Y Another feature is'the provision'of aspeed governr., agitated. by the' .nifeivr mehfiism :for 'C02-.1.- trolling" the *operatin of the cam *shaft and` 2 thereby that ofthe reeds tensioning, locking' and releasing mechanisms in vthe transmitting of 'a cal1.." m

f Other novelfeatures and advantages of the in?- vention willappear fromsthe following description and by theclaimsr appended thereto, reference being had` to the accompanying 'drawings' in* mehr' `5 .o L e Fig. r1 isan elevation viewjshown in perspective:

with the indicating wheels in the operated or reg-- istrng position.

"Fig, 2 is a top view ofthe call:,transrritell mechanism shown 'with' the casing Aremoved ffromj 'f its supporting base, the operatingparts' and c"o[ bined'code and indicating wheels being 'shown A normal non-operated position..l f Fig. 3 isa left side elevation view showing the casing partlyin vertical section and the operating parts in normal non-operated position. Fig. ,f4 is'atopview of the digit setting mechaniSm showingfthecombined code and indicating wheels in normal non-operated position, the keys being shown in horizontal section taken on line. 4 -4 ofFig.3.. f Y Fig. 5 is a right side elevation view of the digit vsetting-mechanisnfi shown with a number of operatingparts with portions out away, theA keys. andthe code YWheels being shown in normal non operatedposition. l n. y Figp is a horizontal sectional View. of the code Wheels setting mechanism taken on line 6.,- 5

of Fig. 5.

yFig.- 6A is a right side elevation view of the combined-code and indicating wheels setting mechanism and their Yresetting mechanism shownin normal non-operated position, anumberlpf operatingv parts being shown with; portions cut away.. .5 Figg-GBis a partial view of the-digit setting mechanism enlarged. l Y l o l k'7 ris anassembly view of the codejwheels settingj mechanismqshown 'in' vertical ysection taken on line 1 1 of Fig. f1, the combined digit bei-of operating parts being shown with portions 'cutawayr a 1 f 10 is avertical section taken on hne Ill- I0 of Fig. 9r showing the combined code and indieating wheels schematically.

Fig. 10A is a view of the cam shaft used in the l generator actuating mechanism showing the position of the cams in angular relation to each other.

Fig. 11 is a partial View shown in vertical secy tion taken on line II-I I of Fig.49.

Fig. 12 is a'partial view shown in vertical Ysection taken on line 4I2-I2 of Fig. Y9. Fig. 12A is a detail View showing elements of the reeds actuating mechanism and a number of 1 operating parts in section.

Fig. 13 is a partial view lshowing the motor interiorly formed and concentric to the code wheels WI, W2, W3, etc., the springs 66 being coiled'on the hubs of their krespective wheels WI, W2, W3, etc., with one of their ends hooked to a bar ab journaled in upright supporting plates Ill and II andthe other ends of these springs hooked to their respective code wheels as at point Y H shownin Figs. 2, 4, '7k and 8.

mechanism in vertical section taken, on 'line f VI3---I3 of Fig. 9.

Fig. 14 is a partial view'showing the mechanism for controlling the return movement of the carriage to normal unoperated position and for bythe pawl-like -members `under control of the y cam shaft.

Y o Figs. r15, 17, 18, 19 and 2o are views of the combined code and indicating wheels shown in different operated positions relative to thev feeler members mounted on thev carriage; and

V, Figs. 21 and .22 Vare views of the indicating strips or dialsV carried by the c'odevvheels,` the strips being showndeveloped. .Y Y .Inthe drawings as shown in Figs. 2, 3, 5 and 6A, abase Bis provided for securely mounting two uprghtsupports I Il `and II held in parallel relation to each other ,atpoints above the plate B by yspacer plates I2 I3, .I4 and IIIA, best seen in Figs. 'Zand 8, spacer .plate I2 having at its opposite longitudinal edges slots I5, I5X serving to hold, key members KI, K2, K3, Kil,` K5, K6, K1, K8, KS and KIU in spaced relation to each other on a common .shaft I6 journaled atjboth ends in bearings in plates III) and II, While the spacer plate I 3 is provided with inwardly extendingv `projections PfPI serving as bearings for-pivotally mounting'an arm I'I for movement parallel vto the plane of base B to `perform a function which will be hereinafterv described in detail. `v

The key members KI, K2, K3, etc., are held in normal nonoperated position by similar retractile springs I8 coiled on shaft I6 and having one of their ends extending through openings in the plate I2 and their other endsy hooked to their respective Akeys whilea cover plate I9 securedvat its' corner portions to upright supports I and I I by similar screws at points 120, 2l, 22 ,and 23 is provided to close 'a rectangular opening OP in a casing 24 serving for housing the transmitter` serving as a bearing for the horizontallymovable mechanism, this cover plate having openings through which theknobs ofthe keys Kl, K2,K3, etc., protrude in registry with letter designations y printed o n the cover plate, while numerical designations are printed 'on the :respective keys vas shown in ',Figs. 1 and 2. Y

Onuprightsupports I0 and vII is journaled a shaft 25 on which are mounted for .free rotation thereon the code wheels WI, W2', W3, W4, `W5, W6 and Wythe 'code wheels WI and W2 having dials in the form of strips ZI -printed with similar letter designations as 'shownin Fig. 21, while the code wheels W3, W4, W5, 'W6 land W1 are provided with dials Z3on which areprinted the digits `lto 10 in the order shown in Fig. 22-corresponding to the digit printed on the keys and the letter designations which are printed on the cover 'plate l'l'.hepavvls 26 are pivotally mounted on a shaft 28 journaled in upright supports I@ and II and are formed with downwardly extending projections 29 best seen in Figs. 6A, 7 and 8, disposed for successive engagement by a flexible reed 30 carried at the free end of pivoted arm II, the latter being movable transverse of code elements Wl, W2, W3, etc., step by, step by the tension -of a spring 3l undercontrolof an escapement mechanism consisting kof twocooperating saw-toothed racks 32 and 33, seel Figs. 6 and 6B, the latter being formed vat its ends with arms 33 pivoted on shaft 28 for swinging movements as effected by the operation of anyone of the keys KI, K2, K3,

etc., in a manner which will be hereinafter de-` scribed in detail, while the rack 32s. securedat both ends to similar lugs 35 formed yand laterally extending from the upright supports Il! and II.

The arm Il is moved .in normal starting position following each call transmitting operation by is pivoted as shown in Figs. 4, 6v andv 6A on a stud 3l laterally extending from the uprightrsupporting plate I I`. The operation of this handle lever as for causing the operation of the arm II .is effective to tension a spring 3,8, coiled on stud 3l and having one of its ends hooked to the arm l3I-andits other end connected to one endvof a rod 39, the other end of which engages a slot in a sector-shaped portion 4I secured to and arm -I'l,.the slot 40 (see Figs. 2, 4 and 6)`V providing a motion take-up `for the rod ,39 whereby the arm' may be returned rto normal unoperated position following the return `movement of escapement arm I'I Vand reed 30 vcarried thereby to normal .position while performing another function which will be hereinafter described in detail.

llheV operation of vhandle leverA 36 fromfthe position pn to the` position pnl is as above described effective tov return the larm Il and the flexible reed 3B carried thereby to normall starting position shown in Figs. 2, 4,6 and '7 while tensioning thek spring y.3l and actuating a U-shaped b'ir 32 in a movement concentric to the code wheels WI W2, W3, etc., this bar having'its arms I3 and 44 pivoted on shaft '25, and connected through an extension 44A (see Fig. 5A) to a rod 43, Vthe other end vof Whicheonnects with lthe arm 36, the movement of bar 42 engaging projections at .455 4carried by each of the Vcode wheels W I W2, W3, etc., for returning them collectively to normal non-operated position following each code transmittingoperation and/or for cancelling a Wrong callsettingoperation, while the move,-

. .tor-y to their movements for the setting of Ia call.

5. The keys KI, K2, K3, etc., as shown in Figs. 5,6, 6A, '1 and 8 are provided with cam surfaces Cl, C2, C3,=C4, C5,.C6, C1, C8, C9 and C|0 disposed in engageable relation with a common bar '41 of 'cylindrical cross-section secured at both ends to -tran-gularly-shaped lever members '48 andy 49 in turn pivoted on a shaft 5|)l journaled in bearings formed with the upright supports ID and Shaft 50 serves also for pivotally mounting setting pawls rl, r2, r3, r4, T5, r6 and r1 extending in engageable relation withrespective spirally-shaped ratchet elements el,` e2, e3, e4, e5, e6and e1`fo'rrn'ed with `the code wheelsWl, W2,W3, etc'. These pawls'as best seen in Figs. 6A, 7 and 8 are'operated collectively against the tension of similar retractile springs 52 by the common bar but set into positions relative .to theteeth of their respective spiral ratchet elements' e|, e2, e3, etc., by the diierent swinging movements of bar 5| as imparted by the camming portionsCl, C2, etc., of key members KI, K2, f

extends transverse of key members KI, K2, K3,

etc.','to the undersidejthereo'f for movement by the operation of any one of the keys. This bar serves for actuating an angle lever 56 also pivoted onshaft vlli and' havingone of its arms Ms extending downwardly for-connection. with one end of aY rod 51, the opposite end kof which is lconnected to a yoke 58 best seen in Figs. 7 and 8 pivotally mounted on a stud 59 extending laterallyfromupright support coaxially disposed to stud 31 serving as pivot for the handle lever 35. The upperextending arm of yoke 58 engages a pin B0 laterally extending from the arm 34 of pivoted escapement element 33 Vfor normally holding the latter in retracted position as shown in Fig. 7 by the normal tension of a spring 38 where the escapement element 33 locks with a spring-pressed pawl 6| engaging a. projection 62 of this element. A lug 63 carried by escapement element 33 is provided for engaging the escapement element 32 for controlling the angular or swinging movement of, escapernent element 33 tow-ard operated position and thereby controlling vthe movement of pawls 26 as effected `loylthe successive operation of the reed under the tension of spring 38 following thepivotal movef. ment of the yoke 58 timed to occur pri-or to the disengagement of spring-pressed paw] 6| from escapement element 33, the operation of which forces the reed 30 against the downwardly extending arms 29 vof retaining paWls 26 for moving them out of engagement from the concentrically formed ratchet elements 21 of code wheels Wl, W2, W3, etc., in response to the succeeding operation of key members KI, K2, K3, etc.. for setting a call. l

L, vThe mechanism for transmitting signals ac-` cording to the settingof the .code Wheels` Wil, W2, W3, etc., consists of a handle lever member 1G keyed to one end of a shaft 1|, Figs. 1, 2, 9, l0 and 13, for manual operation outside of the casing 24.' Shaft 1| is journaled in two upright supporting plates 12 and 1-3 best seen in Figs. 2, 9 and 10 secured at their lower ends to the base B and on shaft 1| between the plates 12 and 13 is keyed a gear sector 14l meshing with a pinion 15, keyed on a shaft 15 formed with a ratchet wheel 11 and on the shaft 15 is mounted for free rotation thereon agear, 13actuated by the ratchet whee111i throughetwo diametricall-y lil) opposite 'spring-pressed pawls IUITHII', see Fig. 13. The gear 18 meshes with a pinion 19 formed at one end of a sleeve 80 to the other end of which is keyed 'a gearlfthesleeve 80 mounted forfree rotation on a shaft 82 journaledin the' supporting plates 12 and 13 while to the opposite ends of vsh-aft 82 are securely mounted the lever members 83 and 84 best seen in Fig. 9 provided to perform a function which Will be hereinafter described 4in detail. The gear 8|, best seen'in Fig.` 13, meshes with a pinion 85 keyed to one endrof a, cam shaft 86 vand. with a pinion 81, secured for,Y movement as a unit with a gear 88 'on a'spindle 89 extending laterally from supportingfplate 13. The rotation of gear 88 is imparted toapinion 90 keyed to the shaft of a centrifugal speed governor CGr best seen in Figs. 2, 9, 10 and 13 provided for controlling the operation of cam shaft 86 as imparted by the gearing mechanism above described under V-the tension of a motor f spring 9|, vthelatter having one of its ve'nds hooked to avstud 92 supported by upright plates 12 and 13 and the other endof thisspring is connected to a 'rb'd93 vin-turnhaving its opposite end connectedto the gear sector 14 by a pivot 95,'the gear ratio being such 4as to impart seven turns' to cam shaft A86 for each manual operation 'of handle lever member 10 'or half turn of gear 18 "as controlled by a pawl or arm 95 mounted 'for-free' rotation on shaft v1| `with its 'freefend positioned by a spring 91 in engageable relation with two diametricallyopposite'pins 96 best seen in Figs. 9, V1'0 vand 13 laterally extending from the gear 18 for arresting the movenrient of the motor mechanism following'each half turn of gear 18, or as above mentioned, seven Aturns of cam shaft 8.5.

Arm 95 is disengageable from any or one of pins V96 asthe case maybe by an arm y99, ysee Figs. 9 and-14,"keyed on shaft 1| for engaging a pin |00 extending laterally from the arm 95 through an opening in the plate 13 upon the operation of handle lever 10 as'for tensioning the motor springl. i y

A pair of upright supports |02 and |03 best seen in Figs. 2,'9fand 10 are secured at their lower ends .to thebase B and Yon these lsupports are 'pivotanymountedgs Gnshafts |04 and m5, the

arms of a setof Ufshaped barsfBl, B2, B3, B4 and Bwhilelon shaft |04is also pivoted a plate |06 having a downwardly turned portion |01 substan- -tiallyconcentric' to pivot |04, see Fig. 3, provided U-shaped bars B, BZ, B3, B4 and B5 in engageable relation with'the'free end of plate |05'but` to permit the movement of this plate as effected .by a cam I||` onV cam shaft .86 independently of vloarsll|,..l3i2, B3, B4 and B5 in combinations determined by the set position of code wheels WI, W3, etc.,v as will be hereinafter described in detail. Plate |06 as showin in Figs. 2, 9, 10, y11 andy 10A1is formed with a downwardly extending arm 109 to the-free'en'dofv which is mounted a roller Hl 'disposed Ain :engageable relation with the cam H'Lkeyed' on cam shaft 86 for operatthe plate: |05 and thereby the bars BI, B2, B3, B4 and B5v through'the tension of'itheir 'respective springs |08 but asabovementioned vin combination depending upon-t efsetting of od'e wheelsWj,W2,W3,.etc;f if 'f f? ihje movement of bars Blf, B2, B3,B4'andlB5, as effectedlby theirV respectivesprings` 08;-1'up'n `the,movement of plate-i361. byrcam-EI Il; eifectivel to 'impart reciprocating; .movemtszolfre shaft vI I2 itself supported at both ends in bearings sin lan inverted U-shaped plate IIS.vv These feeler members are held inoperative relation with the bars Bl, B2, B3, B4 and B5 byV retractile springs Sl, S2, S3, S4 and S5, while the inverted Ufshaped plate H3 is secured as by rivets to a rectangularly-shaped plate yH4 having tracks -I |5and |I-6, Figs. 11 and 12,; cooperating with a-stationary plate H9 having-race tracks H1 and .-I |8to form a ball bearingmounting for the carriage -|I3 thus formed, the plate H9 being formed lintegrally with Athe `upright support |03 as shown in Fig. 9 while a spring |22 hooked to a pinPXlaterally extending from the carriage plate H4and'its other bent to'an'arm PXI extending longitudinally of plate |I9 is provided for re-v .member |24 pivotedon a stud |26 laterally extending from the supporting plate II9. To the lever |24 is mounted-a'flat Yspring or reed V|21 yieldably heldby a spring I24X, Figs. 10A and 11,

against a ratchet toothed rack r|28 securely mounted on the .plate I|4 of carriage H3. A retaining pawl I23,fo'r the rack |28, Figs. 10, 10A, is formed with a projection |30 provided for disengaging the reed |21 from the rack |28 simul- .taneously `with its own disengagement from rthis rack so .as to permit the carriage to 4return to normal position under the tension of its retractile spring |22, the operation of retaining pawl |29 against the tension of its retractile spring X| being effected by a spring retracted rod I3I, see Figs. 9 and 10, having one Yof its ends connected to lever 84, keyed `on the shaft 82 for movement vas a unit withv lever 83, keyed to the other end of shaft 82 and having its free end in the form of a ,cam disposed in engageable relation with one cf the diametrically opposite lpins 95 on gear 18 so as to be operated once for each half turn of this gearor seventh turn of cam shaft 86 and there- .fore seventh reciprocating movement of lever r|24 'as effected by the cam |23.' The rack |28 is formed with'seven teeth th of a .pitch corresponding to the spacing of combined `code and indicating wheels WI, W2, W3, etc., onshaft 25 so as to place in each step the feeler members PI, P2, P3, P4, P5 pivoted on carriage ||3v in registry to the successive code portions of wheels WI, W2,'W3, etc.

On the baseB is mounted an alternating current generator best seen in Figs. 2, '3, 12, 12A and ,-16 consisting of pole-pieces |40 and I4|, a coil |42 and five vibrative reeds VI, V2,V3, :V4 and V5, tuned lat differentfrequencies, clamped between the Apole pieces |40 and |4I vand extending in engageable rrelation with a corresponding number Io flever members as m1, m2, m3, m4 and m5 pivoted on a shaft |43 journaled at both ends in lugs formed with upright support |02. Shaft |43 also serves for pivoting a plate |44 formed with .a downwardly extending arm |45 best seen in Figs. .10,.10A and 12` having aroller |46Y engag- TaCe V8. inga cam A|41 .keyedon cam shaft 8.6, therotation of which in cooperationwith-a retractile .spring |48, see Fig. 12, imparts reciprocating .movement tothe plate |44 for collectively kand successively tensioning the springs |46 -to `cause the lever members ml, m2, m3, etc., ,to tension their-respective vibrative reeds VI, V2, V3, V4 and V5.

The springs |46 have one of their lends lsecured to similar studs |50 carriedby eachlever `meinber m|, m2, m3, etc., and bear on lugs |4I'toforce the lever members ml, m2, m3, etc., againsttheir respectively associatedvibrative` elements VI, V2, V3, etc., to ex them upon the operation of plates |44 by the movement of cam |41 due tothe en gagement of the downwardly extending portion of this plate at the free end thereof with the springs |46, while lugs I46X formed .with lever members ml', m2, m3,'etc., rest .on theirrespective springs |46 for returning the lever Imembers to normal position following the release of spring |46 by the return of plate 44 to normal under -the tension of its retractile spring |48 but as-controlled by latching members ZI, Z2, Z3, Z4 vand Z5 as. will be hereinafter described Ain detail to `permit the free operation of the vibrative elements VI, V2, V 3, etc., when releasedbya common pawllike member |58 actuated by a, cam |59, see Figs. 3 and 10A, intimed relation to the operation .of plate |44 and that of the plate |06 by cam III and-lever. |24 by cam |23 while springsas `I5I tensioned against the undersurface of lug .|41 serve to return the lever members mI, m2, m3, etc., in a follow-up kmovement with that vof the common plate |44 toward retracted position.

To the upright support |92 Ias shown in Figs. 2, 3, 9, 11 and 12 .is securely mounted .a stud |52 extending perpendicularly .therefrom to serve .as a spindle for the latching members ZI, Z2, Z3, Z4 and Z5. These latching members are moved in engageable relation with the free ends of their respectively associated springs |46 by the tension of ribbon-shaped. springs |53 following the downward movement of plate |44, such .engagement serving .to khold the springs |46 tensioned and the arms m, ym2, m3, etc., operated with their corresponding reeds VI, V2, V3, V4 and V5 tensioned during the operation of a number of bars BI, B2, B3, etc., in predetermined combinations as dened by the setting of the` code wheels WI, W2, W3, etc., while similar camming portions |54` formed Yat the upward extending ends of latching members ZI, Z2, Z3, etc., extend through slots in lugs |55 formed perpendicularly with the bars BI, B2 and B3, etc., to provide bearing surfaces moving against the c-amming portion |54 of latching members ZI, Z2, Z3, etc., upon the upward operationof U-shaped bars BI., B2, B3, etc., as effected by the springs |08 .move able with .the plate |96 so as to pivot the latches ll, Z2, Z3, etc., for disengaging them from the springs |46 and thereby freeing. vthe arms mi, m2, 'm3, etc., which are returned to normal by springs I 5| tok permit Athevibrations of elements V|, V2, V3, etc., thev corresponding feeler members of which are .permitted to enter the notches in the code wheels WI, W2, W3, etc., which is followed by the release of these VibratiVe ele ments by the common Ypawl-like rmember |58.

Ina typical operation in the setting and transmitting of signals corresponding to a telephone call designation for example CH 31000, the operation of key K2, in registry with the letter C, the rst letter of the code designation above mentioned, printed on the cover plate I9 vis' effective to actuate the bar 4| Athrough its camming 4porfV tion C2, see Figs. 5, 6, '7 and 8 and thereby the bar I both carried by the triangularly-shaped lever members 48 and 49 pivoted on shaft 50 for collectively positioning the setting pawls rl, r2, r3, r4, f5, r6 and r1 relative to the teeth of the spirally formed ratchet portions eI, e2, e3, e4, e5, e6 and e1 of the combined codek and indicating wheels WI, W2, W3, W4, W5, W6 and W1.

The operation of key K2 also actuates the common bar 55 and angle lever 56 pivoted on shaft I5 simultaneously with the operation of setting pawls rl, r2, r3, etc., and actuate the yoke 58 through rod 51 best seen in` Figs. 7 and 8 for tensioning the spring 38 which, as above mentioned, is coiled concentric to stud 59 and one of its ends hooked at the point hgto the arm 34 of pivoted escapementelement 33A for operating it upon the release of the latterby the oper- Aation of spring-pressed pawl 6| which operation is effected by the movement of yoke 58 through its arm 64 engaging the arrnBIA of pawl 6| as vshown in Fig. 8. The operation of escapement element 38 by the tension of spring 38 iromthe position shown in Fig. `'l to the position 'shown in-Fig. 8 is effec-tive to engage the reed 36 now at points IY, Fig. 6B, to move and disengage it from the tooth 5Y of stationary rack V32 Vwhen the lever I1 under tension of spring 3| is moved a small angular movement limitedy by the `engagement of reed 30 with tooth GY of movable rack 33 and the reed 38 is now in position indicated in dotted line in alignment with the downwardly extending arm 29 oi pawl 26 to move it out of engagement from the concentric ratchet portion 2 1 of code wheel W,I,Vupon the continued swinging movement of escapement element 33 for permitting the'operation of wheel WI Aunder the tension of its retractile spring 66this wheel being arrested by the tooth of its spirally-formed ratchet portion engaging its respective setting pawl 'rI indicated in Fig.416 thus setting the code wheel WI to the position -corresponding to the key depressed that is,V

.ABC

yoke 58, to normal position. In that positionv the yoke 58 reengages the pin 60 carried by arm 34 of the pivoted escapement element 33 for returning the latter to `normal position vwhere it is held by the latch or spring-pressed pawl member 5I.` Upon the return vmovement offescapement element 33 to normal position, the reed 30 which is now to the position 2Y is arrestedby the apex of tooth `5Yy`of` the stationary rack element, 32 causing.. its disengagement from the tooth GY during thev continued retu'in movement of escapement rack element 33 for permitting the movement of lever VI1 under the tension oi spring 3| so as to move the reed 30 in position SY against the tooth `IY of stationary escapement element 32 preparatory to the 4operation of the succeeding key, that is, key

GHI 4 'fthe second digit of the telephonecall designation above mentioned. ,The returnoi. movable vrack 10 element 33 permitting the pawl 2t to engage the corresponding tooth of ratchet portion 21 for holding this wheel in the set position.

The operation of key tation ofthe code wheel W2 will be arrested by its respectively associated setting pawl r2 engaging the tooth 4 1 Fig, 17 of spirally disposedV ratchet portion e2. The release of wheel W2 is eiected by the movement of rack;element 33 from normal followed by the movement of lever I1 under the tension of spring 3| to place the reed `30 against. the tooth 8Y of movable rack 33 in registry with the downward extending arm 29 of retaining pawl 26 associated with code wheell W2. The return movement of`key GHI s T to normal position and the consequent arresting of the movement of reed 3l|v by tooth 'IY `of stationary rack 32, permits the movement'of the lever I1 vfor placing the reed 30 carried-thereby against the tooth 9Y of stationary rack '32 and this cycle of operations for the'setting of wheels W3, W4, W5, `W5 and W1 to the position registering 31000 is similarto that described in connection with the code wheels WI andWZ'set by the operation of the keys A f respectively. It is to be noted that the retaining pawls 26, unlike the setting pawls r'|,\r2, r3, etc., are operated individually and successively by the transverse movement of reed 30 and that the other retaining pawls with the exception' of the pawls whichis in registry with the reed 30 remainin engagement withv their respective code Wheels during the operation of any particular key. j

The manual operationof handle lever 10 following the setting ofthe :telephone call designa- ABC `GHI v y'2 j- 310ml Y as above described-is effective to tension the motor spring 9| and to impart apivotal movement to arm 95 for disengaging it from one of the pins 96 as the lcase may be carried by gear 18, the operation of arm 95 being effected through the movement of arm 99 keyed on the shaft 1| and engagingthe pin |00 carriedby arm 99'.

meer@ f l1 the speed of which is controlled by the governor CG actuated bythe pinionlrand gear l88 mounted for rotation asa unit on spindle 89, the gear ratio as yabove mentioned` being such as to impart seven turns to cam shaft Bt for each operation of handle lever 'lo or half turn of gear wheel 78. V`With the carriage ||3 in normal position as shown in Figs. 9 and 10 and the motor spring tensioned by the downward movement of handle 10, the rotation of cam shaft 86 through cam |46Y imparts a'downward movement to the plate |44, Figs. 10, A Iand 12,` for tensioning the springs |46 and thereby causing the arms mi, m2,'A`m3, m4 and m5 to 4tension their respective vibrative elements Vl V2, V3, V4 and V5 through the, engagement of the springs with lugs lill of levers mI,y m2, m3, etc. Upon the continued operation of cam shaft 8S, the cam ipermits the common pawl-like member i to move in position wherein the vibrative elements are collectively held in lthe tensioned position and retained in such a; position due to theA latch members ll, vl2', Z3, etc;, engaging the free ends of springs |46nas shown in Fig. l5 at the` maXimum down- .ward movement of plate |44. However, upon the i return of plate |44 tonormal unoperated position following the continued operation ci cam shaft 86. and the movement of plate li anumber-of` U-shaped bars as in., this example bars b3 and b5, see Fig. 16, are perrrlittedl to follow the movement of plate |96 under the tension of their springs m8 due to feeler members r3 and 15 entering the notches in the code wheel Wl thus causing the movement of their respective latch- 4ingmembers Z3 and l5 operated by U-bars b3 and band therefore the upward-movement of arms mBandmE under the` tension of their springs ISI which is followed bythe operation of pawl-like member |58 by cam IEEland ythe consequent operation ofjvibrative elements V3 and V5 for transmitting alsign-al corresponding to the operated key K2, while the upward movement of feeler member RI, R2 and Ril is prevented during the movement of plate IE5 by the engagement of these eeler members 'with the periphery of code -Wheel Wilt'. Y, l Y

-The cam |23 is now in position to engage the' roller at: the end of lever member |24 for pivoting the-latter against the tension of its retractile Y spring |,25veand causes the reed |21 to eneage'the' tooth/ 'X|, Fig, l() vof rack |28,rto move it and the cani-age ||3 one step in the direction indicated bythe arrow for positioning the feeler members PI, P2, P3, P4 and P5 in registry with the code wheel 'W2 where the carriage H3 is held in this one of the pins 96 as` the case may be carried by gear-wheel 18 engages the arm 83 for imparting a small angular movement to its supporting shaft 82 yand thereby to lever 34 keyed to the other endof this shaft for moving the rodV |3| longitudinally against the tensionj of its retractile springVV |32 for` pivoting the retaining pawl |29 to disengage it from'rack |23 vwhile nexing the reed |21 away fromf this rack soas to permitthe re-Y *turnV movement of carriage' |'|3*to normal-starting positionv under the tensionV of its retractile spring $22, `One of the pins 95 immediately following the operation of pawl |23 and'l reed |21 engages the arm S5 to stopthe rotation oigear wheel '.18 and that of gear sector l, The indieating wheels WI, W2, W3', etc. vare then returned to normal non-operated position whileretensioning their-,actuating springs by the manual operation of handle lever 35 lrotating the |bar 42 concentric to the wheels and' imparting a pivotal movement .to lever il through -rod'39 for returning this lever and the reed 3i! carried thereby to normal starting position and the transmitter is new ready for a succeeding call setting and transmitting operation,

What is rclaimed is: Y

Y l. In a call transmitter, a set of key members,

a plurality of code wheels, an actuating spring for each ofsaid wheels, a handle means actuatedr by the operation of said handle for rotatingsaid wheels for collectively tensioning said actuating springs, means for holding said wheelsvin normal position against the tension of said actuating springs, each of said key members'having a cam, an escapement mechanism' responsive to the o-peration of each of said key members'for successively operating said holding means to cause the operation of said wheels by said actuating springs, and other means actuated differentially by the cams of said key members for controlling the movement of said codewheels to positions for settinga call.

2. In a call transmitter, a setv of digit key members, code wheels, a plurality of motor springs for actuating said wheels, a handle, a pivoted'bar Y actuated by said handle for collectively moving v said wheels from operated to normalposition for tensioning said motor springs, ratchet elements .of different characters Vcarried by each of said wheels, operable means cooperating with the ratchet elements of one of said characters for` bers, a pluralityfof vcoole Wheelaspring means for actuating said wheels, ratchet mechanisms for holding said code wheels in normal non-operated position against the tension of said spring means,

a mechanism actuated by each of said key members for successively operating said ratchet mechanisms for permitting the movement of said 'wheelsunder the tensionof said spring means,

other ratchet mechanisms, spring actuated means ,t controlled by the operation of each of said key members inv timed "relation to` the operation of the second-mentioned mechanisms for controlling the movement of said code wheels to positions corresponding to the operation of said key members, means carried by said code wheels for indicating such positions, a handle and means operable by the movement of said'handle for returning said code wheels collectively to normal position, the return of said code wheels tensioning said spring means.

4. In a call transmitter, a set ofkey members,

La shaft, a plurality of combined code and indieating wheels mounted for free rotation on said V' "W'h'eels for setting av call.

`m`ovement"concentric to said Wheels, and manushaft,-a plurality offnormally tensionedlspring means for rotating said wheels, ratchet elements carried Vvby said Wheels concentricthereo4 pawls *engagingvv said ratchetwheels for-'normally hold- 'ingthe-latter in normal non-operated `position f5 "against the tension kof Asaid spring means, other ratchet elements carried `by said-*Wheels spirally thereof,v a-pawl operatively associated with each Vof-said spi-rally disposedl ratchet elements, each nofssaid key members having a cam, an escape.- 110 mentfmechanism operated by said key members forfsuccessively actuating the pawls of the firstmentioned ratchet elements to cause the operation vfof said code wheels under the tension of said spring-means, and a mechanism actuated by lj5 dicating-Wheels, aplurality of means actuated by said key members to cause the operation of said Wheels to positions corresponding to the digits of `s aid key members,spring means for actuating vsaid, Wheels to said positions, a supporting shaft forsaid Wheels, 'a -bar pivoted on saidshaft for ally" operable meansV forjactuating Vsaid bar for f Ilo returning said wheels to normal position for cancelling a call and simultaneously collectively ten- -sioningsaid spring means.

j 6.."In a call transmitter, a set of digit numbered key'me-mbers,-a set of Acode wheels," means actuatedby'the successive voperation of said key members to cause the movement of said Wheels to positions corresponding to the digits of said key members for setting a call, an alternating current generator having vibrative elements, a motor spring, @im al handle, for tensioning said motor spring, a cam shaft rotated 'by said motor spring, and a plurality of Ameans Yactuated by said cam shaft for 'controlling the operation of, said vibrative ele- I ments according Yto the code `wheels n l vser by the-iis operation of said key members. I 47j. lIn a call transmitter, a set of digitnumbered key members, a plurality of code "Wheels,-a plurality of meansactuated by said key members to.,

causfetheA successive movement of ,said wheels to50 'positions for setting acall, a carriage, feeler mem- "be'rls movable onr said carriage, an alternating "curentgenerator' having vibrative elements, a

motor, and a plurality of'means actuated'by said,

` forsetting a call, an alternating current gener-. i

ator having a plurality of vibrativereeds, motorvl means, agcamshaft actuated by said motor means, feeler members, a mechanism actuated by said camshaft for positioning'said feeler members in registry positions Withsaid code Wheels in a stepvactuated by said cam shaftY to cause said feeler members .to engage said code Wheels for determini ing thel'operation of saidvibrative reeds at each 'of' said steps for *transmitting signals according' to the operation of said key members.

andere 'I4 L V9.`=In'4 a Ycall ,transmitter, a i. S'etofikey'members', a plurality of code Wheels,`normal1y. tensioned 'spring means for .actuating said.wheels,-means normally holding said wheelsagainst movement under ther tension of i said; spring means, means actuated by said key members for 'operating the second-mentioned means tol causeA the movement -of.,-said vWheels in position corresponding tothe operation of said key membersrforsetting-,a call, an alternating currentgenerator havingvibrative elements, a motor mechanism having a cam shaft, a plurality of U-shaped bars, kfeeler members, .a stop and go actuating` mechanism operatedby said camshaft for moving said feeler members transverse of said code wheels; meansactuated by said Acam shaft for tensioning said vibrative elements, other means operated by said cam Shaft for actuating saidA bars for engaging-said .ifeeler members with said `code Wheels upon each-stop transverse of the latter, and a third means actuated by said cam shaft for momentarilyholding said vibrative elements tensioned duringtherengagement of said feeler members with .said code Wheels, said third means operating for. releasing said ,vibrative elements'to cause their operations according to the settingV of said code Wheelslg. ,1a.

10. In a call transmitter, a set of digit nurnbered key members, code wheels, kan escapement mechanism, ratchet elements actuated by the successive operationof said key members tocause the movement ofV said wheels into. positions-for setting a call, a carriage having ieeler members movable thereon,` an alternating currentqgenerator having vnormally tensioned vibrative elements, a motor spring, a handle lever fortensioning said motor spring, a cam shaft,-agearing mechanism connecting said camshaft tosaid motor, and a step-by-step operable mechanism actuated by the movement of said cam shaft for successively moving said carriage for positioning said feeler members in coacting relation Withsaid code Wheels and releasing said vibrative elements to cause their vibrations in timed relation with the step-by-step movements of said carriage for transmitting signals corresponding to the operation of said key members. l i

.11. In a call transmitter, a set of key members,

4 code elements movable upon the operation of said key members into positionufor setting aA call,fa plurality of U-shaped pivoted bars, feeler, meinbers disposed for operation by the movementof said bars, aY cam shaft, a'pivoted plate actuated by said cam shaft, `spring means tensioned bythe movement of said plate for operating said AU"- shaped lbars 'for moving said vfeele'r members in coacting relation With said code elements, an a1'- ternating current'generator having vibrative elements, another plate actuated 'by said cam" shaft, spring means tensioned collectively oy the opration of the last-mentioned plate, arms moved by 'the tension ofthe last-mentioned springs' for flexing said vibrative elements, a 'common'lat'clling member operated by said camshaft for niomentarilyholding 'said vibrative elements "terisioned, camming means actuated bythe 'operation of said U-shaped bars as determined Kby said code Wheels for' releasing'a number of the "lastmentioned springs Afor permitting the"ie'turn movement to normal of a corresponding number by-step movement collectively, and other means of said arms prior to the collective release'ofsal'd vibrative elements by said common latching member, the release and vibrations o f"` said elements upon the successive operations of "the rlst and"eccomi-mentionedv plates and said Acon'nnon latching 'memberv underr control of saidcami'shaft 175 transmitting'signals corresponding tothe operation 'of said key members.

.. 12. ma calrtransmitter, a set of digit numbered key members, aplurality of code and indicating wheels, normally tensioned spring means for actuating said wheels, operable ratchet elements for holding. said code wheels in normal position under thetension of said spring means, ya mechanism actuated by the operation of said key members for successively operating said ratchet elements for causing' the movement of 1 said Wheels in positions for setting a call, spirally formed'ratchet elements carried by said wheels, a

l 'setting pawl associatedwith each of said spiral each of said steps and reciprocating movements for actuating said vibrative reeds for transmittingsignals corresponding to the operation of said key members,- and manually operable means for returning said Wheels to normal non-operated position and tensioning said spring meansA following the transmitting of the call.

- 13; In aI callA transmitter, a set of key members, a plurality of code elements, normally tensioned springs for moving said elements to positions determined rby the operation of said key membersfor setting a call, means actuated by saidkey members for'deiining such positions, a

rail support, a carriage mounted on said supportfor movement-transverseA of said code elements, a camv shaft, a mechanism actuated by said'cam shaft foreiecting the transverse movement of said carriage, Vpivoted VU-shaped bars, feeler members mounted on saidcarriage and operated byv thev movement of said bars upon the transverse operation'of said carriage for placing said feeler members successively in coacting relation with said code elements, a plate actuatedby said cam shaft, spring means movable withsaid plate for moving said bars to cause the engagement of said feeler members with said code elements, an alternating'current generator having vibrative eleactuatedby said'cam shaft, a plurality of springs tensioned'coll'ectiveiy by the operation of the lastmentioned plate, arms'movable by the tension of the last-,mentioned'springs for f'eXing saidV vibrative elements', means actuated :by said cam shaft' for momentarily locking said vibrative elements 1 in said tensioned positions, camming means actuated by the operationofsaidv U-shaped bars as determined by the set positionsV of said code Wheels for releasing a number of the last-mentioned springs for permitting vthe freeing of a corresponding number of saidreeds by said arms, the release ofthe last-mentioned vibrative elements transmitting signals corresponding to the operation ofsaid'key'members, means operable at the completion ofthe transmitting of the call for rreturning saidV carriageV tonormal non-operated positiontand means manually operable for returning: saidfr code. elements to normal unoper- Y l ments, one for each'of said bars, anotherv plate' 16 Vated position and tensioning each of the firstmentioned'slOringS: 14, In a; call transmitter, ajset of key members, a vplurality of combined code and-indicating movable elements, each of saidv elements having aconcentrically disposed ratchet portion and a spirally shaped ratchet portion, normally tensioned springsV for actuating said movable elements, pawls engaging said concentric ratchet portions for holding. their associatedmovable. elements in normal position against theA tension of said actuatingsprings, cams of diierent Yvalues carried by'said key members, means actuated by said cams for positioningthe pawls associated with said sp-irally formed-,ratchet portions for.

limiting the movement of saidcombined code and indicating elements to positions corresponding to the digits or" the operated key members following the release of said elements by the pawls engaging said concentric ratchet portions, anV angle lever, a bar operated by the movement of each of said key members for actuating said angle lever, an escapement mechanism actuated by the movement of said angle lever for actuating the pawls engaging said concentric ratchet portions for permitting the successive movement of ysaid elements for setting a call, said mechanism comprising a pivoted arm having its free end movable transverse of said combinedl code and indicating elements, a normally tensioned spring for moving said arm in such transverse movement, a yieldable member carriedby said pivoted arm at the free end thereof, a stationary rack having teeth forengagement with said yieldable member for successively retaining said arm and'said yieldable member VinV positions relative toV the pawls associated with said spiral ratchet portions, a movable rack, a'yoke actuated by the pawls associated with the spirally shaped-ratchet portions of said elements, for. setting and indicating the call, an alternating current generator,

a motor mechanism controlled by said code andl indicating elements for actuating said generator,

`and manually operable means for returningfsaid combined code and indicating elements and said pivoted armV tol normal position following the transmitting of aV call and/orv for cancelling' a call.

DAVID B. PARKINSON.

REFERENCES CITED 'Ifhe-iollowing references are of record in the le of this patent:

UNITED STATES PATENTS Number` yName DateV 2,358,586V Newe11` l Sept. 19, 1944 2,315,344 Mallna Mar. 3'0, 1943 2,307,525 Marina V Apr. 1; 1941 2,121,584 C'alkins June 21, 1938 2,258,266' Sengebusch Oct. 7, 1941 2,285,153 Y Fletcher -en Junefz, 1942 

